Answered

Which of the following developments in vaccines occurred most recently?

AA vaccine using weakened viruses is developed to combat polio.
BA vaccine against tuberculosis is developed.
CA vaccine against hepatitis B gains approval from the government.
DA vaccine against anthrax is developed.

Verified Answer :

Kalahira

The correct answer here is C - out of the developments listed, the most
recent development in the use of vaccines was the approval from the
government of a vaccine that can be used against Hepatitis B. This
happened relatively recently, in 1981.